1.25Gbit/s光接收机CMOS共栅前置放大器  

1.25 Gbit/s CMOS common-gate preamplifier for optical receiver

作　　者：田俊 [1] 王志功 [2] 梁帮立 [2] 冯军 [2] 胡艳 [2] 章丽 [2] 熊明珍 [2] 施毅 [3] 郑有炓 [3] 

机构地区：[1]东南大学射频与光电集成电路研究所,南京,210096,南京大学物理系,南京,210093 [2]东南大学射频与光电集成电路研究所,南京,210096 [3]南京大学物理系,南京,210093

出　　处：《东南大学学报（自然科学版）》2004年第5期574-577,共4页Journal of Southeast University：Natural Science Edition

基　　金：国家 8 63计划资助项目 (2 0 0 2AA3 12 2 40 ) .

摘　　要：设计并实现了用于光纤用户网和千兆以太网光接收机的CMOS前置放大器 .电路采用共栅结构取代常用的共源结构 ,大大降低了输入电阻 ,使得光检测器的寄生电容只影响非主极点 ,从而获得宽带 .提出了一种优于电阻反馈的有源反馈 ,可获得比普通共栅结构更宽的带宽 .测试结果表明 ,在输入 80 5 μA的光电流时 ,电路的单端输出电压摆幅大于 64mV(峰 峰值 ) ,均方根抖动在 36ps以下 ,可稳定工作在 1 2 5Gbit/s的速率上 .A (complementary metal-oxide-semiconductor) CMOS preamplifier for optical access network systems and gigabit Ethernet systems is realized. A common-gate topology other than a common-source one is adopted to reduce input resistance. As a result, the parasitic capacitance of photo detector (PD) can only shift the non-dominant pole and has neglectable impact on the dominant pole, which makes it possible to achieve a large bandwidth. Moreover, an active feedback branch, which is better than conventional resistive feedback network, is used to attain even wider bandwidth. The circuit has a single-ended output voltage larger than 64 mV (peak-to-peak) with an input photocurrent of 805 μA. The root-mean-square (rms) jitter is below 36 ps. According to above measurement results, the implemented preamplifier can operate well at standard bit rate of 1.25 Gbit/s.

关 键 词：前置放大器 CMOS工艺 有源电流负反馈 共栅结构 

分 类 号：TN722[电子电信—电路与系统]